I just created an account so I could comment on this as well. I am not a QB user, but we are seeing the same issue with one of our vendors. They can't send us invoices because of the IPs being listed in Spamcop. I am also surprised that none of their other customers are reporting this. We also don't want to add the IPs in to just blindly allow potential malicious emails thru. Let's go quickbooks, get those IPs out of your send list or get Spamcop to remove them.